diff --git a/maldoca/js/ir/transforms/dead_code_elimination/BUILD b/maldoca/js/ir/transforms/dead_code_elimination/BUILD
index 2a50b5e..46b397d 100644
--- a/maldoca/js/ir/transforms/dead_code_elimination/BUILD
+++ b/maldoca/js/ir/transforms/dead_code_elimination/BUILD
@@ -29,6 +29,7 @@ cc_library(
     hdrs = ["pass.h"],
     deps = [
         "//maldoca/js/ast",
+        "//maldoca/js/babel:scope",
         "//maldoca/js/ir",
         "//maldoca/js/ir:jsir_utils",
         "@abseil-cpp//absl/container:flat_hash_map",
diff --git a/maldoca/js/ir/transforms/dead_code_elimination/pass.cc b/maldoca/js/ir/transforms/dead_code_elimination/pass.cc
index 7981ccb..9b68c85 100644
--- a/maldoca/js/ir/transforms/dead_code_elimination/pass.cc
+++ b/maldoca/js/ir/transforms/dead_code_elimination/pass.cc
@@ -31,6 +31,7 @@
 #include "absl/container/flat_hash_map.h"
 #include "absl/log/log.h"
 #include "maldoca/js/ast/ast.generated.h"
+#include "maldoca/js/babel/scope.h"  // IWYU pragma: keep
 #include "maldoca/js/ir/ir.h"
 #include "maldoca/js/ir/jsir_utils.h"
 
@@ -98,16 +99,6 @@ struct SymbolInfo {
   std::vector<JsSymbolId> outer_definitions;
 };
 
-bool operator==(const JsSymbolId& lhs, const JsSymbolId& rhs) {
-  return std::forward_as_tuple(lhs.name(), lhs.def_scope_uid()) ==
-         std::forward_as_tuple(rhs.name(), rhs.def_scope_uid());
-}
-
-template <typename H>
-H AbslHashValue(H h, const JsSymbolId& m) {
-  return H::combine(std::move(h), m.name(), m.def_scope_uid());
-}
-
 JsSymbolId GetSymbolIdFromAttr(JsirSymbolIdAttr symbol_attr) {
   std::string name = symbol_attr.getName().str();
   std::optional<int64_t> scope_uid = symbol_attr.getDefScopeId();